Alternating-current machine with commutators and with compensatng windings.



No. 846,427. PATENTED MAR. 5, 1907 R. RIGHT-BR. ALTER'NATING CURRENT MACHINE WITH GOMMUTATORS AND WITH GOMPENSATING WINDINGS.

APPLICATION FILED mm. 28.1906.

RUDOLF RICHTER, 0F CHARLOTTENBURG, GERMANY AS slGNOR TO SIE- MENS-SOHUCKERT-WERKE, G. M.

PORATION OF GERMANY.

B. 11., OF BERLIN, GERMANY, coa- ALTERNATlNG-CUBRENT MACHINE WIT H COMMUTATOR S AND WlTH COMPENSATING WlNDlNGS.

Specification of Letters Patent.

Patented March 5, 1907.

Application filed August 28, 1906- $erial No- 332,359-

To all whont/ it may concern.-

Be it known that. I, RUDoLF RICHTER, a subject of the Emperor of Germany, and a resident of Charlottenburg, Berlin, Germany, have invented new and useful Improvements in Alternating-Current Machines with Commutators and with Compensation- Windings. i

The present invention relates to alternating-current machines with commutators and with compensation-windings, and an important object is an alternating current machine having a commutator and having a compensation-winding connected in series with the armature and having auxiliary fields for canceling the electromotive forces enerated in the short-circuited armature-coi s by the pulsating main field, in which machine the compensation-winding or a part of it is .simultaneously used for producing the'auxiliary field, an electromotive force'being applied to it or to the said part of the same, which electromotive force is supplied from the secondary winding of a transformer connected in parallel with the machine. 7

.The present-invention consists in an improved alternating-current machine having" ,a commutator anda compensation-winding, and in order that the details of construction and action of my'invention may be more clearly understood, reference is made to the accompanying drawings, in which Figure 1 shows diagrammatically a machine hitherto used with a s allel to the termina s of the machine.

Fig. 2 shows diagrammatically a machine in Y the short-circuited armature-winding of alternating-current machines with commuta' tors in consequence ofv thelpulsating main field may be canceled, as is known, by an auxiliary field of suitable hase and strength in the 'neutral' zone. itherto a special winding h, Fig. has been employed for this ecial Winding in pararallel .purpose, said winding having the same axial the compensation-winding c or to a part of the same without otherwise altering 1ts connection. Preferably only a part of the compensation-Winding is employed for th s, as is indicated in Fig. 2, thecompensation-winding consisting of the two parts 0, and 0 Such an electromotive-force is applied to the part 0 that this art of the winding creates the same field as t e special auxiliary winding according to Fi 1. Now this electromotive force is referab y obtained by means of a transormer t, of which the primary winding 1) is connected to the net in parallel with they machine, while the part 0 of the compensation-winding is fed by the secondary winding s with current of suitable phase and strength.

forproducing the auxiliary field, is situated in conformity with its pur ose next to the neutral zone, for no auxi iary field is required outside the range of the short-circuit ing of the brushes, but the total load factor v is the (g're'ater the less the auxiliary field is extende a v Thedistribution of the winding for a twopole motor is diagrammatically represented in Fig. 3, in which drum-winding is supposed.

The exciting windin (which is concentrated as much as possi le) with the axis ma; is indicated by dotted lines 6 e. The dis tributed compensation-winding with the axis y y is divided into two parts in each half of the stator'i. e. the central part 0,, to which the secondar transformer-winding s, Fig. 2 is connecte and the outer art 0 The connections of the active con uctors may of course run otherwise than as'indicated in the figure.

holds perfectly good. if the transformerwinding 1) is not connected in parallel with the whole machine, as shown in Fig. 2, but

The validity of the above explanation While the construction of parts which is preferred has been described in the foregoing s ecification, I am aware that numerous o anges of construction may be made without departing from the spirit and scope of my invention, and I therefore do not wish to be understood as limiting myself by the positive terms employed in connection with the description, excepting such as the state of the art may require.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, in an alternatingcurrent machine of the type described, of an armature-winding, a compensation-winding connected in series thereto, a field-magnet winding connected to said compensationwinding, means connected electrically di rectly with said compensation winding adapted to produce a difference of potential' between one part of the compensation-winding and another part of the same whereby an auxiliary field is produced, forthe purpose specified.

2. The combination, in an alternatingcurrentmachine of the type described, of an armature-winding, a compensation-winding connected in series thereto, a field-magnet winding connected to said compensationwinding, means connected electrically directly with said compensation-windin adapted toproduce a diflerence of potentia between the one end and the other end of the same whereby an auxiliary field is produced, for the purpose specified. 1

3. The combination, in an alternatingcurrent machine of the type described, of an armature-winding, a compensation-winding connected in series thereto, a field-magnet winding connected to said compensationwinding, the primary winding of a transformer connected to two parts of said machine'between which a difference of potential normally exists, the secondary windingof said transformer connected to two different parts of said compensation-winding whereby an auxiliary field is produced, for the purpose specified.

4. The combination, in an alternatingcurrent maehineof the type described, of an armature-winding, a compensation-winding connected in series thereto, a field-magnet winding connected to said compensatlonwinding, the primary winding of a transformer, a'resistance in series with the same, said primary winding and resistance being connected in parallel with said field-magnet winding, the secondary winding of said transformer connected to two different parts of said compensation-winding whereb an auxiliary field is produced, substantially as described.

5. The combination, in an alternatingcurrent machine of the type described, of an armature-winding, a compensation-winding connected in series thereto, a field-magnet winding connected to said compensationwinding, the primary winding of a trans former connected in parallel with said fieldmagnet winding, the secondary winding of said transformer, a resistance in series with the same, said secondary winding and said resistance being connected to two different parts of said compensation-winding, whereby an auxiliary field is produced, substantially as described.

6. The combination, in an alternatingcurrent machine of the type described, of an armature-windin a compensation-winding connected in serles thereto, a field-magnet winding connected to said compensationwinding, the primary winding of a transformer, a resistance in series with the same, said primary winding and. said resistance being connected in parallel with said field ma net winding, the secondary winding of sair transformer, a resistance in series with the same, said secondary windingrand said latter resistance being connecte to two different parts of said compensation-windin whereby an auxiliary field is produced, substantially as described.

RUDOLF RICHTER.

Witnesses:

WOLDEMAR HAUPT, HENRY HASPER.

'ICO 

